Showing tag results for Code

Adrian McCarthy ran into a problem where didn't work when called from a handler. You already know how to solve this; you just have to connect the dots. See if you can do it on your own before the answer is revealed.

Commenter Jonathan Scheepers wonders about those programs that flash their taskbar button indefinitely, overriding the default flash count set by . The function and its simpler precursor let a program flash its window caption and taskbar button manually. The window manager flashes the caption automatically (and Explorer follows the caption by...

Data can change without the breakpoint firing.

I know most of you know this, but I'm going to say it for the record. When you have a dialog box with an OK and/or Cancel button, do not give the keys accelerators. In other words, simply write The dialog manager already has those buttons covered. The hotkey for the OK button is Enter (since it is the default pushbutton), and the hotkey for the...

Here's a question that came from a customer. By now, you should already have the necessary psychic powers to answer it. Our program calls to indicate that it exited unsuccessfully. The process that launched our program waits for the program to exit and then calls to retrieve the exit code. The function succeeds, but the exit code is zero! How c...

Alun Williams pointed out that if you pass invalid parameters to , it does not destroy the . Well, yeah, because if you pass invalid parameters, then all bets are off. Different functions perform different degrees of parameter validation; the degree to which this is done is typically guided by security concerns. Information that crosses securi...

When you register a window class (with the or function), you get an back. What use is this atom? Not much. You can use this atom in many places where a window class name can be used; just convert it to a string with the macro. Let's change our scratch program to illustrate: We save the atom returned by the function and use it (in the...

The moment the Windows developers got a system for converting strings into numbers, they could use it anywhere they need to, well, convert a string into a number. Somtimes these integers are officially declared as atoms, but most of the time they are just integers that happen to be atoms under the covers. I'll start with registered window messages...

Multi-threaded apartments do not pump messages.

Commenter Peter Kankowski asks why Windows doesn't send and messages when the user logs off. That's what is for. To tell the program that the Windows session is ending, and that you should get done whatever last things you want to get done before the world comes to an end. Windows doesn't send the message because sending becomes complicated...